Don't worry about sharks. Worry about Ze Killair Beez!
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I was curious and did some research. Most of the cow attacks happen in the spring and involve humans and dogs. Cows have maternal instincts so when a dog or human gets between them and their calves, they freak out.
Biggest mistake people make is picking up the dog when the cow goes after it. Let the dog run away on its own. Pick it up and you make yourself a target.